Tweak compaction candidate selection to avoid keeping page with low occupancy around.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 5e82872da1e2ea0fa48db0508d62cdafd57c04f5..39797190712456ceea38f25c9f4ef121f6687107 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1521,7 +1521,8 @@ void Logger::LowLevelLogWriteBytes(const char* bytes, int size) {
 
 
 void Logger::LogCodeObjects() {
-  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask);
+  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogCodeObjects");
   HeapIterator iterator;
   AssertNoAllocation no_alloc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
@@ -1576,7 +1577,8 @@ void Logger::LogExistingFunction(Handle<SharedFunctionInfo> shared,
 
 
 void Logger::LogCompiledFunctions() {
-  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask);
+  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogCompiledFunctions");
   HandleScope scope;
   const int compiled_funcs_count = EnumerateCompiledFunctions(NULL, NULL);
   ScopedVector< Handle<SharedFunctionInfo> > sfis(compiled_funcs_count);
@@ -1595,7 +1597,8 @@ void Logger::LogCompiledFunctions() {
 
 
 void Logger::LogAccessorCallbacks() {
-  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask);
+  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask,
+                          "Logger::LogAccessorCallbacks");
   HeapIterator iterator;
   AssertNoAllocation no_alloc;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {